Great video! Actually, the first number (small #) represents the weight of the oil, or how thin it gets, at lower temperatures. The "W" stands for Winter. It's based on a designated amount of oil flow at zero degrees F. The second number is for after it's warm, measured at 210 degrees F. So in theory, as long as the first number is not much lower (you wouldn't want spin-off when it's designed for loose tolerance) then the higher number would be better for heavier loads where the axle is hotter than normal.
I have 2004 Mercury Mountaineer AWD, which is basically a cosmetically changed Ford Explorer. The original owners manual required 75W90 for the rear diff., but Ford started to have lots of failures on Explorers' rear differentials so they changed their viscosity numbers several years ago. Now they require 75W140 for the rear differential which is also a full synthetic oil. Thanks for the video.
Thank you god for people like this guy he explained so well my 8yr old understands this guy. So calm and relaxed in front of the camera with a great tone of voice so it was easy on the ears.Which in turn you listen easier to the details.i was using 75w 90 but after this video in Az and as much as I use my Challenger Sxt 140 probably better idea consider car is super heavy it’s 110 most summer days and I put 150 miles a day on my car.
I will help clear the numbers for you. The first number is the weight of the oil or lubricant. The lower the number the better flow characteristics when it's cold. The second number is something totally different than what everybody believes. A 75-140 is still a 75 weight lubricant, the 140 means that when it gets up to operating temperature it has the same thermal protectant and weight as a 140 weight but only at operating temps but is not a 140 weight. It will always be a 75 weight. The second number only signifies the thermal protection at operating temperature. Another example is a 20/50 is a 20 weight oil but at operating temperature and has the same thermal protection as a 50 weight. I understand everyone gets confused on that and most places that you go in and talk to mechanic they still do not know the proper definition. I can tell you with absolute certainty that what I have described is the correct way. I hope this helps
And i will help clear the numbers for you. The W for winter and it means the oil viscosity in low temperature (cold) the second number is the oil viscosity at 100° (hot) and those numbers are grades defined by society automotive engineers (SAE)
I've noticed once it gets under 32f 75w-140 vs 75w-90 it's a bit thicker when you first start driving, I'm guessing I should wait 5 minutes before driving at highway speeds so it get flow more smoothly.
Should I use 75w 140 in the Deep South. It's 97 to 107 temp in summer. Winter we might have 3 days below freezing! Normally it's warm in winter too! This is a four runner and they recommend 75w-85
No, W in oils stands for winter and has nothing to do with it's weight. Please don't spread misinformation, learn the facts before repeating what people repeat.
Thank you for the informative video. I ordered some diff oil online and they gave me the wrong kind. Your video saved me the hassle of returning it. Turns out I got a good deal by their mistake.
Thanks a lot for your explanation. I could not find 75W-85 in my country so I got 80W-90 instead since I live at hot country. My car is Lada 2110 and I live in Egypt :D so it is totally different conditions I think. Thanks again.
Go to School Son Look at the temperature viscosity index for those two oils. You going to see a huge difference. 75W90 full Sintetic is very good for cold weather 75W140 is good for racing in the summer.
The only way you can formulate that wide range of protection is with full synthetic. Like engine oil, aka: motor oil. Always keep the lower W (winter) number, but go as highest possible with the straight number. My oil cap requires 5W-30 Conventional, but I use 5W-50 Full synthetic. I've been using Castrol Edge since it became available in the early '90s. I do use Mobil1 75W-140 on both differentials and Transfer Case. Back in the '80s I used a 20W-50 latter spring to early autumn, then 5W-30 or better 5W-40 for Michigan winters on V8, V6 Chevys. My '03 2.7 4x4 automatic Tacoma has 269K miles and runs like a top. Rack and pinion, along with in and out power steering hoses recently replaced. Water pump once, fan belts twice, exterior door handle, all lighting except backups. Service: Every 30K engine coolant and automatic transmission power flushes. Motor oil every 3K, rear diff every 30K, front diff and transfer a total of 3 times. Highly impressed with Toyota quality. It's all about maintenance.
I couldn't agree more with your entire comment, I love it! It definitely does come down to maintenance, and you can never go wrong with a Chevy or a Toyota!
I have the same truck. The owner’s manual says to use sae 80w-90 GL-5. Myself use the the 75w-90 in the front and 75-140 in the rear. Reason being is that my 98 Silverado has the heavy 1/2 ton 14 bolt 9.5 rear. With towing a trailer I figured it would hold up better. That’s just what I do 🤷♂️
I think your definition of viscous isn't correct. You say the 75w is better in the winter compared to the 80w because it is more viscous. No I think it should be less viscous. If something is viscous that would mean a resistance to flow. In the winter you want something that will flow easy aka less viscous
I'm glad you said that because that's what tripped me up in this video. I couldn't work out why you would want the oil to be more viscous in the winter since it would naturally get thicker when it's cold.
My outputshaft seal is leaking where the drive shaft bolts in to the pinion gear I'm going to have it replaced this week coming that being said I had nothing to top it up with other than 85w 140 that was mixed with my 80w 90 I'm in Canada it is summertime and I've been driving it like this for 2 weeks now am I in the safe Zone
Sorry, but you’re exactly wrong on your theory of the weight difference in thickness 140 flows 140 mL a second it high temperature where the 90+90 so the 140 is definitely thinner
I just picked up a 93 Jeep Grand Cherokee (Laredo) 217,000 miles, live in southern MO, No plans on towing or off roading as of now. Asked around and I'm getting all different answers on what gear lube to use. On the tag (Rear Diff) it also states to use a "Limited Slip Diff Lube Only (Additive) with my gear lube. What would you recommend on the particular Gear lube and do I buy the additive (Anti-Friction Modifier) separately or what? PS: The front diff has no tag stating, "Use Limited Slip Diff Lube Only" So do I use the same gear oil as used in the rear but without the additive (Friction Modifier) ? Would appreciate your expertise and your time. Thx Much.
I would bet my bottom dollar that the 75w-140 is thicker in winter temps than an 80w-90. Yeah, it is rated at lower viscosity, but barely. So, the only difference is the hot temp rating. Viscosity stabilizera break down quick, so the 75w140 will most likely be and stay thicker very quickly. Either way though, your info is all valid, no flaming here.
Thank you for the insight! I wouldn't bet against you on that either. I do notice a little hit to fuel economy which tells me that the 75w-140 stays a little thicker. But it's definitely got the protection when I need it for the hot rating so it's worth it.
AMSOIL Severe Gear® Synthetic Extreme Pressure (EP) Gear Lube comes in 75W-90, 75W-110, and 75W-140 FTW . I prefer Amsoil's synthetics vs most other synthetics, that being said, any of synthetics is going to be just as good. Cannot go wrong
I'm sorry if you didn't like the video. It is over 4 years old though, so it's not a video made lately. Also I'm aware that I'm not an oil expert, however the information is correct and gives you the basic understanding you'd need without getting too in depth.
I always felt this was true but wasn't sure. I run 20w50 in my engines but have been rethinking that on my turbo rig. Do you think it takes longer to heat up the thicker oil as well?
That’s why you run the weight recommended by the manufacturer… ie 75w and 80w are pretty much the same … you don’t want to run anything higher or lower than that because testing has shown that those weights protect differential the best…. For example I have a 2004 jeep TJ… for daily driving I agree 80w90 is fine… but I tend to abuse my differential especially when towing… that’s why my rear axil gets 75w140… front axil I go back and forth between 80/99 and 75/140… usually 80w90 on the spring,,, 75w140 in the fall when I am most likely to need 4 wheel drive.
my manual says I should use 75w-90, but cannot find that in the local stores...but can find plenty of 80w-90, is this a big deal to just use that instead?
I have a BMW R1200R motorcycle, for the cardan they recommend a 75w-90 oil, but I put a 75w-140 on it, could I have a problem? I live in a temperate country, Spain All the best.
Hi, Could you please advise the right engine, gear and lsd diff oils for 2002 Tahoe. It is used in a rather hot climate 35-40 C in summer. I feel that factory specs are somewhat insufficient in my case. Thank you in advance!
philip dias AMSOIL IS ALL HYPE! Schaeffer MFG is Americas oldest oil company. They provide some of the best lubricants in the world. Schaeffer has 53 Certified Lubrication Specialists, how many does Amsoil have? Anyone who has seen Schaeffer up against any other oil knows it cannot be beat as far as engine protection. www.schaefferoil.com Since 1839 these guys know their lubrication!
Good info and one more important piece of information to add. Some of the gear oil does not contain a friction modifier,If you have a limited slip differential that will need to be added or costly repairs will soon show up.
I own a 2007 fj cruiser that requires SEA 90 FOR ABOVE 0' Fahrenheit And 8w or 80w-90 below 0' degrees Fahrenheit do you think I can use 75w 90 just make sense for me.
I have 80-90 gear oil in my Kubota Lawn tractor gear box. If I buy the one 75w140 that you recommend, can I just add it to the 80-90 oil in the gear box or can you mix them?
thanks buddy! I just changed out the oils yesterday. I put 75w90 in front and 75w140 in rear. Wanted to put 75w140 in both but went with the 75w90 in front instead.
you are creating different resistance levels between the differentials and that creates stress on the system. if the manufacturer doesn't indicate difference in viscosity between the diffs then you shouldn't do otherwise.
@@minogoda how much stress because they're pretty similar for it seems. Can you out the 75w-140 in the front differential? Seems like the gearing strength would be different from front vs back?
Is there really much difference? Dealership put 75w140 instead of 75w90 like the manual says, I really ever tow. I think the only thing different would be like a 5% decrease in MPG. May have been something they changed back a few years ago.
There really isn't a whole lot of difference no, but usually even if you do tow with the vehicle once in a while, factory suggested oils in the owner's manual will be just fine.
good video man , what is the difference between hypoid and synthetic , i have a 73 Dodge Charger with 8 3/4 with sure grip what do you recommend , been ttold that hypoid is better thanks in advance
+anil k If I come across an 07 Edge that needs this work done I will definitely make a video of it for you! As of right now I don't even know anyone that drives a Ford Edge though. I'll keep my eyes peeled, thanks for the comment!
What would you recommend for a 2013 dodge challenger rt? My manual says 75w90 with friction modifier but the dealer says my car is supposed to use 75w-140 with none. I love in california for now but eventually i will move back to the midwest where it can get pretty cold in the winter. Your advice will be greatly appreciated!
Ryan Vaal do what the manual says not the person who told you at the dealer because he could be wrong cause he’s not dealing with just your car or pick up truck, he’s dealing with every car in the dealer...
Ryan in my research if there is a limited slip diff. on the vehicle of any kind the friction modifier is a MUST. it protects as well as aides the diff. as far as colder climates I would use the heavier 75w140 if the temp were going to be a constant freezing or below. (However I also realize that this does void any warranty if any thing fails) 32 degrees or below for several days in a row can be enough to freeze oil/break fluid/transmission fluid not the resoviors or holding tanks as much as condensation in the lines.
My pinion seal has been leaking. Ran just about dry. I bought a quart of synthetic 75w-140, not enough, added a half quart of valvoline conventional 85 -140, not enough, added a full quart of 80-90 marine that was for my boat. Will they all mix and work to lube the diff and bearings till I change the seal? Or am I going to do any damage? Better than running dry, I figure. Thx Ken
That's a good question...my best advice is that it's okay to mix them as a 'limp home' thing to make sure you don't run dry and get you to where you need to go, but i would change out the seal and the fluid as soon as you can just to be safe, before any premature wear and tear begins to happen.
Hi, I just bought a 2015 Toyota Tacoma PreRunner V6 with 100000 miles.I live in Wilmington,NC. I tow a 20ft. Boat. 3500 lbs.The manual say 75W-85 GL-5. Should or can I use mobile 1 75W-90 ? Thank for your time/videos Jim
Hi. My motorcycle uses semi 10w40 oil. I have in a quart a mix of liqui moly, Motul and Wolf Belgium semi synthetic on excedent from previous bottles when changing oil. Can I use this tree brand mix with identical API and JASO specs? Thanks in advance.
First number is the cold viscosity, the second number is the operating temp (90°C) viscosity. So these oils all THICKEN up when they get warm. (Like engine oils)
No, they do get thinner. But they protect as well and hold up as well as a 90 or a 140 weight oil would at 100 degrees Celcius, rather than just a 75 weight. Think about pouring oil in the middle of winter compared to draining it from your oil pan after the engine runs. It's thicker when it's cold, that's just how fluid dynamics work. Thank you for the comment though!
Does all these 3 oils have almost same viscosities and can be interchangeable as a gear oil in transmission of 110cc gearless scooters. SAE 10W30 engine oil , API GL-4 SAE 80W-90 gear oil and GL-4 SAE 90 grade gear oil.
I just changed my ram 1500 diff fluid with 75w90 in the rear diff it has a lsd and I went with Royal Purple because it has the friction modifier already in it…. Anyone else have any experience with royal purple. I didn’t add the mopar additive because it says it has the friction modifier already.
My Honda ATV calls for 80W-90 in the rear and front differential. I would like to switch to synthetic and I have found that most synthetics are in 75W-90. In your opinion, is it safe to go from 80W to 75W?
For 2012 awd Sienna, Toyota manual says 75w85. The service departments keep 75w140 and use that in everything that comes through I’m in Ohio What would be best for the transfer case & differential? Thank You
Transfer case and differentials would all depend on what Toyota recommends. I'd stick with what they say for those because they're probably specific fluids.
Hi midwest garage I live in Mexico and I was wondering which oil should I use for my differential for my Nissan pickup I tow a lot I put like two tons I use it daily also what do you recommend on how long should I change differential oil
That depends on what your manufacturer recommends. Most LSD's will need some sort of additive though, so please keep that in mind when choosing a gear oil.
Can you reply to me kind a like ASAP to let me know if mag1 Oil SAE 85W-140 would work in my RC car differential for the gears I don’t wanna open it without knowing what’s someone else thinks
Can I use API GL-4 SAE-90 GEAR OIL in Transmission of TVS Jupiter or Honda Activa 4G 110cc gearless scooters? Will it reduce the performance, pickup & milage and increase the wear & tear of transmission gears of scooter? TVS company manual recommended to use same engine oil (10w30 JASO MA2) as the gear oil in transmission also.
I think for these diffs the ideal lubricant is a 75w110 with 4 oz of ACDelco additive. You could use the mopar stuff if you'd like, but being a GM differential I'd stick to GM OEM and go with Delco. Hope this helps, and thanks for the question!
I'm rebuilding my differential in a 94 Dodge Ram 350 passenger van has the 9 and 1/4 differential actually basically what I'm doing is putting new bearings and seals the pinion gear is humming is there anything special I should put in the fluids after putting it all back together
If you use a synthetic gear lube that should have all the stuff you'd need in the fluid. You'll here some people say you shouldn't use synthetics in older diffs and in some limited slips, but that's simply a myth. Other than that if it is a limited slip be sure to add LS additive and you should be good to go. Thanks for the comment!
Thank you for your response look I have a question since I'm sending you a message now I have gotten everything back together actually what I've done is I went in and rebuilt the rear end I'm putting it back together as we speak I put the gear paint on the ring gear to see where I was getting contact should I remove all that from the rear end before I finish it off or is it okay to leave it on.
Bear in mid that the more the difference between the the two viscosity (cold and hot), the more the oil will follow the higher number while it is deteriorating. I.e: 75W-140 has a difference of 65 75W-90 has a difference of 15 As both oil types get old and contaminated, their overall viscosity will be higher and their property may be: 120W-150 85W-95 So, a lower cold viscosity number does not necessary mean that it is going to hold that so long. The oil has to be in check.
Yup. All oils break down over time and need changing, you are right. They won't perform the way they're supposed to after time and so they need to be changed. Thanks for the comment!
Motor oil I’d use a 5w30, and for axle lube I believe they take an 80w-90 gear lube...but that could be wrong since it’s military grade. Try googling “TM-9-2320-289-20”. That’s the technical manual for those trucks and it should have everything you’d ever need for that truck. Those things are awesome by the way, I’ve always wanted one!
got a question. I changed my front diff seal and it still leaks. original seal was bad. manual recommends 75-90 and I changed to a 75-90 synthetic after I put in new seal. Should I change to 80-90W NON synthetic because I heard that synthetic gear oil may actually cause leaks, especially on a truck with high mileage. thanks for any advice.
That's a good question...a lot of myths out there about synthetics are simply not true, whether it comes to synthetic motor oil, transmission fluid, or gear oil. However, if you do have leaks even after changing out the seal you could definitely try out an 80 rather than 75. It might not do the trick, but it's worth a shot. Just know that usually the "synthetic causes leaks" is a myth. I could go more in depth but really whether it's synthetic or not, it's the same viscosity so that's not what causes the leaks. Basically the leak started or continued because the old fluid was so gummed up and old that it simply plugged the leaks. So even if you changed it out with non-synthetic it would have probably continued to leak out because the new fluid was not gummed up and would be able to seap out of those tiny leaky areas. I hope this helps bud, and thanks for the question!
Ok I highly recommend to follow what owner manual or manufacturers. There’s the difference between 75w90 and 75w140. 75w140 design for vehicles that towing heavy loads like close to maximum of Gross weight Combined rating or maximum , people who using for racing like accelerating hard all the time, however will sacrifice gas mileage…. 75w90 does give you better gas mileage and if towing occasionally then that for you, but if towing frequently but loads not even close to maximum and or if worry about gas mileage then you wanna go with full synthetic 75w90 which better than regular 75w90
I have a 49cc gasoline scooter. Could you kindly inform me what particular GL4 gear oil to use. I don't plan on riding during the winter months, and I reside in MA Thank you very much
last week I changed out factory fill in rear diff "g80" with ac delco 10_4016 75w 90. now the rear end acts like its lock during slow right turns. any idea on how I fuck this up.
I have a 2006 Honda Ridgeline the manual says T-case oil takes sea-90 weight. The dealer gave me 75 -85 but I'm going to be driving it in hot weather towing a trailer I think what they gave me is wrong.
oils are tested at 40C for the W number and at 100C for the second number. common mistake is people think oil is thinner when cold but the scales are diffrent .
zloben9000 how you read multi weight oil designation is that the oil behaves like what ever the first viscosity is at that 40 degrees celsius and behaves as the second viscosity at 100 degrees celsius. lower viscosity oils are thinnet than higher viscosity, but no matter the viscosity, oils gett thicker as the temp decreases
That wouldn't be a bad one. I'd go off manufacturer's recommendations, but if you have similar conditions to what I talked about a 75w-110 would be good for your rear diff.
Midwest Garage manufacturers recommendation is 80W90 hypoid oil, I like to use synthetic oil so best option for me 75W110 fully synthetic hypoid gear oil 👍💯
Great video! I have Highlander 2011 4WD. The manual says 80W-90 GL-5. I could not find synthetic 80W-90. Can I use 75W-90 Mobil 1 synthetic? I am just afraid because 80 is different than 75? Which is better for the car? What about summer will 75 not be good as 80? Thanks
I would stick to the manufacturer's recommendations, especially in a nicer vehicle like that. One important thing however, if they tell you to use a GL-5 gear lube, definitely use GL-5.
Thank you so much for your reply. Just want to understand what is really the difference between 75W-90 and 80W-90. 75 is thicker than 80 or the other way around. Also do you think 75w synthetic will offer better protection in winter than 80W? Thanks
hello good video I just moved from California to Washington St completely different temperatures right now is snowing and I would like to change my oils on my differentials my truck is a 2006 chevy silverado 1500 5.3 z71 4wd should I use 75w140 all around?
i just accidently put in a quart of 75w-90 and a little more than a quart of 75w-140 in my rear differential. I thought i bought 3 quarts of 75w-140 and accidently bought one 75w-90 and didnt realize until i finished and looked at the reciept and checked my empty bottles. Is that bad or will it cause a problem? Im thinking about just putting in more 75w-140 or just biting the bullet and changing the oil again.
I believe you should be fine. If you want you can replace the fluids. The most important thing about gear oil is that it is clean, and that it is the correct level/amount. ANY gear oil is better than very dirty or very low gear oil. You could use cooking oil to get you to proper service in an emergency - it would be better than nothing. The only thing to be aware of, is if certain gear oils are not recommended because of material incompatibility. IE: if a certain fluid is ONLY recommended because others will damage seals or gearbox metals etc. THEN is when you must be careful. Most light trucks and passenger vehicles with separate differentials are ok with most types of gearbox fluids. But some are very fussy, AUDI, VW, Mercedes, etc. Only put the exact correct fluid in those things. Stay gold.
I live in Texas and I have a 2008 Dodge Ram 1500, what would be the ideal gear oil for my truck? The truck is used for work and back and rarely do any hauling. Thanks!!
+Stephen Lepek If your Ram isn't towing or being worked real hard, use 80W90 in the rear. 75W140 for the front diff. BUT, there is one important step you also need to do! Dodge is one of the few truck companies that still comes with a LSD (posi) as a standard option...so if your truck has it, you need to add some friction modifier to the rear differential when you change the fluid. The friction modifier is just a limited slip additive, and if you're unsure if you have an LSD or not, you can add the stuff anyway with no harm just to be safe. Hope this helps!
Where I live it is mostly hot weather. Much like California or Miami. In the Summer it gets to over 50'C at times. What kind of oil would you suggest for that?
some people dont change gear oils at all it took me 10 mins to do: i changed my gear oil to Synthetic Mannol 75w90 GL5 spec(cheapest synthetic 75w90 i found) , i drive a small 2007 toyota yaris and i dont tow, my recommendation is to CHANGE THE GEAR OIL every 5 to 10 years and dont just top it up, the old oil was GREY and the new was CLEAR-to-yellow car shifts a lot better especially when in reverse. both plugs are 24mm and you need 1.9 liters of gear oil in case someone googles for specs.
I used to own a 2000 Tundra. I couldn't even change the axle oil. I had to buy complete whole new rear end axle at 155,000 miles it went slipping or it will lock up. It was wielded shut it has a cap on top of it. You couldn't even replace the gears till you cut it open. I was told that you had to go to the dealership and have them to do a hose flush to flush out your axle. Was so lame and Never forgotten to do a 4x4 transfer case oil change with the gear oil. I have over 472,000 miles on that V6 4x4 2000 Toyota Tundra. I sold it. Was a beast small mid size truck ever built. I had a custom axle on mine so I could replace the oil. The transmission will go out at 140 to 150,000 miles as well. I do replace the oils system and filters every 60,000 miles. I wish people take care of their cars mores or have the knowledge to do it. Some people have no idea about changing the complete car oil system. Now from now on I used Amsoil in my entire trucks now. I change mine every 60,000 miles on a GM 2500HD or within 4 years just as much as for other things on your vehicle like transmission fluid with new filter, steering oil and breaks oil and changing breaks. I always spent around 350 bucks every time and it worth it. Last you 600,000 miles or more depends how you take care of the trucks or cars that you drives. You would also needed to changing your crank staff chain or your overhead cam chain at 150,000/200,000/250,000 miles depend on what vehicle you have plus the exhaust system replacement as well. Big lesson I learned. I used amsoil gear oil 75Ww140 for a heavy duty used for my aluminum G2 cooling differential axle cover that does added extra oils space as well as it allowed you to change the gear oil too that included the magnetic dip stick. I add 6qt 10.5 on gas and 7qt on 11.5 diesel. And never failed me. I also do change the clutch and gear on the axle at 200,000 miles. You could say I drove over billions of millage in my hard earn years lol..
GREAT CAN YOU SHOW HOW TO CHANGE TRANSFER CASE FLUID IN FORD EDGE 2007 . THE PLACE IS JAM PACKED AND THERE IS SOME OIL LEAK TOO NEAR THE TRANSFER CASE. THANKS
I hear 75w-140 is good to be used in both front and rear diffs. Ive got a 2004 ford explorer 4x4. I dont tow much but will be eventually. Im also going to move up north canada where its damn cold. Think i will stick with 75w-140 for both :-) Would you advise that? Thanks!
+rainy78 Yeah, I would recommend that. Ford & Mercury just recently changed their lube requirements a few years ago. They say to use 75w140 instead of the 75w90 now in rear differentials.
It depends on the differential and what vehicle. The owner's manual should be able to tell you if that's a good one to use or not. Thank you for the comment!
Hmm...I'm not really sure on those Toyotas. I'm thinkin the best way to find out for sure is to use the good old google. Might even be able to find a service manual on line for that vehicle. I hope this helps!
so the manual says lubed for life with 75w 140 if you put anything other then synthetic on its every 3k if you use full synthetic you also need an additive should i change it not knowing the history of the truck btw it has 84k 2005 ford ranger 2.3
I just got a new truck, new to me 2014 Tundra..I went through and changed the rear dif and the trans oil. It gives me the knowledge and satisfaction that its done right!
If you're running it hard I'm sure you could, but usually unless you're doing extreme work in extreme temps I'd stick with the manufacturer's recommendations.
even better run synthetic gear oil has much higher performance in both cold and hot. GM factory fills diffs with synthetic for a good reason, it almost stopped all warranty rear diff claims
One could be synthetic and the other not...but the main difference is that the 75 is slightly better in slightly cooler temps is all, or very slightly less viscous than the 80w90. Those 2 are very similar weights. Thanks for the question man!
Bravo !!! I appreciate learning from a thinking man rather than hearing someone read from a manual.
Great video! Actually, the first number (small #) represents the weight of the oil, or how thin it gets, at lower temperatures. The "W" stands for Winter. It's based on a designated amount of oil flow at zero degrees F. The second number is for after it's warm, measured at 210 degrees F. So in theory, as long as the first number is not much lower (you wouldn't want spin-off when it's designed for loose tolerance) then the higher number would be better for heavier loads where the axle is hotter than normal.
Exactly! This video is more explanation in layman's terms, but you're exactly right.
I have 2004 Mercury Mountaineer AWD, which is basically a cosmetically changed Ford Explorer. The original owners manual required 75W90 for the rear diff., but Ford started to have lots of failures on Explorers' rear differentials so they changed their viscosity numbers several years ago. Now they require 75W140 for the rear differential which is also a full synthetic oil. Thanks for the video.
+seth brown Oh wow, I never knew that! Thanks for the info!
Must be what's similar with my Silverado it's supposed to take 75 W - 90 and they put in 75w - 140.
Thank you god for people like this guy he explained so well my 8yr old understands this guy. So calm and relaxed in front of the camera with a great tone of voice so it was easy on the ears.Which in turn you listen easier to the details.i was using 75w 90 but after this video in Az and as much as I use my Challenger Sxt 140 probably better idea consider car is super heavy it’s 110 most summer days and I put 150 miles a day on my car.
I will help clear the numbers for you. The first number is the weight of the oil or lubricant. The lower the number the better flow characteristics when it's cold. The second number is something totally different than what everybody believes. A 75-140 is still a 75 weight lubricant, the 140 means that when it gets up to operating temperature it has the same thermal protectant and weight as a 140 weight but only at operating temps but is not a 140 weight. It will always be a 75 weight. The second number only signifies the thermal protection at operating temperature. Another example is a 20/50 is a 20 weight oil but at operating temperature and has the same thermal protection as a 50 weight. I understand everyone gets confused on that and most places that you go in and talk to mechanic they still do not know the proper definition. I can tell you with absolute certainty that what I have described is the correct way. I hope this helps
Yes, you are correct. Maybe I was unclear in the video but basically you paraphrased the point that I was getting across.
Thank you for the comment!
And i will help clear the numbers for you. The W for winter and it means the oil viscosity in low temperature (cold) the second number is the oil viscosity at 100° (hot) and those numbers are grades defined by society automotive engineers (SAE)
I've noticed once it gets under 32f 75w-140 vs 75w-90 it's a bit thicker when you first start driving, I'm guessing I should wait 5 minutes before driving at highway speeds so it get flow more smoothly.
Should I use 75w 140 in the Deep South. It's 97 to 107 temp in summer. Winter we might have 3 days below freezing! Normally it's warm in winter too! This is a four runner and they recommend 75w-85
No, W in oils stands for winter and has nothing to do with it's weight. Please don't spread misinformation, learn the facts before repeating what people repeat.
Thank you for the informative video. I ordered some diff oil online and they gave me the wrong kind. Your video saved me the hassle of returning it. Turns out I got a good deal by their mistake.
Thanks a lot for your explanation. I could not find 75W-85 in my country so I got 80W-90 instead since I live at hot country. My car is Lada 2110 and I live in Egypt :D so it is totally different conditions I think. Thanks again.
You're very welcome, I'm glad this video helped you out! Thank you for the comment!
This is what I was looking out for. Thanks for the video.
Glad I could help! Thanks for the comment!
Go to School Son
Look at the temperature viscosity index for those two oils.
You going to see a huge difference.
75W90 full Sintetic is very good for cold weather
75W140 is good for racing in the summer.
Thanks man that really helped most ppl don’t know how to answer that 😊
The only way you can formulate that wide range of protection is with full synthetic. Like engine oil, aka: motor oil. Always keep the lower W (winter) number, but go as highest possible with the straight number. My oil cap requires 5W-30 Conventional, but I use 5W-50 Full synthetic. I've been using Castrol Edge since it became available in the early '90s. I do use Mobil1 75W-140 on both differentials and Transfer Case. Back in the '80s I used a 20W-50 latter spring to early autumn, then 5W-30 or better 5W-40 for Michigan winters on V8, V6 Chevys. My '03 2.7 4x4 automatic Tacoma has 269K miles and runs like a top. Rack and pinion, along with in and out power steering hoses recently replaced. Water pump once, fan belts twice, exterior door handle, all lighting except backups. Service: Every 30K engine coolant and automatic transmission power flushes. Motor oil every 3K, rear diff every 30K, front diff and transfer a total of 3 times. Highly impressed with Toyota quality. It's all about maintenance.
I couldn't agree more with your entire comment, I love it! It definitely does come down to maintenance, and you can never go wrong with a Chevy or a Toyota!
I have the same truck. The owner’s manual says to use sae 80w-90 GL-5. Myself use the the 75w-90 in the front and 75-140 in the rear. Reason being is that my 98 Silverado has the heavy 1/2 ton 14 bolt 9.5 rear. With towing a trailer I figured it would hold up better. That’s just what I do 🤷♂️
I like it man! I wish I had the heavy half...that's a good towing rig for sure.
I think your definition of viscous isn't correct. You say the 75w is better in the winter compared to the 80w because it is more viscous. No I think it should be less viscous. If something is viscous that would mean a resistance to flow. In the winter you want something that will flow easy aka less viscous
I'm glad you said that because that's what tripped me up in this video. I couldn't work out why you would want the oil to be more viscous in the winter since it would naturally get thicker when it's cold.
My outputshaft seal is leaking where the drive shaft bolts in to the pinion gear I'm going to have it replaced this week coming that being said I had nothing to top it up with other than 85w 140 that was mixed with my 80w 90 I'm in Canada it is summertime and I've been driving it like this for 2 weeks now am I in the safe Zone
Sorry, but you’re exactly wrong on your theory of the weight difference in thickness 140 flows 140 mL a second it high temperature where the 90+90 so the 140 is definitely thinner
Can you use that 75w-140 in your front diff to?
I just picked up a 93 Jeep Grand Cherokee (Laredo) 217,000 miles, live in southern MO, No plans on towing or off roading as of now. Asked around and I'm getting all different answers on what gear lube to use. On the tag (Rear Diff) it also states to use a "Limited Slip Diff Lube Only (Additive) with my gear lube. What would you recommend on the particular Gear lube and do I buy the additive (Anti-Friction Modifier) separately or what? PS: The front diff has no tag stating, "Use Limited Slip Diff Lube Only" So do I use the same gear oil as used in the rear but without the additive (Friction Modifier) ? Would appreciate your expertise and your time. Thx Much.
I would bet my bottom dollar that the 75w-140 is thicker in winter temps than an 80w-90. Yeah, it is rated at lower viscosity, but barely. So, the only difference is the hot temp rating. Viscosity stabilizera break down quick, so the 75w140 will most likely be and stay thicker very quickly. Either way though, your info is all valid, no flaming here.
Thank you for the insight! I wouldn't bet against you on that either. I do notice a little hit to fuel economy which tells me that the 75w-140 stays a little thicker. But it's definitely got the protection when I need it for the hot rating so it's worth it.
AMSOIL Severe Gear® Synthetic Extreme Pressure (EP) Gear Lube comes in 75W-90, 75W-110, and 75W-140 FTW . I prefer Amsoil's synthetics vs most other synthetics, that being said, any of synthetics is going to be just as good. Cannot go wrong
My Chevy Matiz manual trans calls for 75W-85 can I put 75W-90?? Thats all there is locally.
i saw a lucas 75w90 it says trans and gear. can you really use it for transmission
versa trac fluid in a buick ?? is it ok to use the 75w 140 instead ??
Thnx bro
What if weather is too hot I'm from UAE which one is good for the rear differential in my Yukon 2015? 75w90 or 75w140?
Who is this guy?!! Sheesh everybody is an oil expert lately. Some people have no business making these videos!
I'm sorry if you didn't like the video. It is over 4 years old though, so it's not a video made lately. Also I'm aware that I'm not an oil expert, however the information is correct and gives you the basic understanding you'd need without getting too in depth.
Something to keep in mind is thicker oils trap more heat in your gear box
I always felt this was true but wasn't sure. I run 20w50 in my engines but have been rethinking that on my turbo rig. Do you think it takes longer to heat up the thicker oil as well?
That’s why you run the weight recommended by the manufacturer… ie 75w and 80w are pretty much the same … you don’t want to run anything higher or lower than that because testing has shown that those weights protect differential the best….
For example I have a 2004 jeep TJ… for daily driving I agree 80w90 is fine… but I tend to abuse my differential especially when towing… that’s why my rear axil gets 75w140… front axil I go back and forth between 80/99 and 75/140… usually 80w90 on the spring,,, 75w140 in the fall when I am most likely to need 4 wheel drive.
@@bigdog4574I think you just contradicted yourself.
Thanks for the explanation very helpful!!!!
my manual says I should use 75w-90, but cannot find that in the local stores...but can find plenty of 80w-90, is this a big deal to just use that instead?
Is the 140 good to use in a f250 zf6 manual transmission
Good Info! If their truck feels sluggish because of thicker gear oil then that thing needs some more balls.
I have a BMW R1200R motorcycle, for the cardan they recommend a 75w-90 oil, but I put a 75w-140 on it, could I have a problem?
I live in a temperate country, Spain
All the best.
Hi, Could you please advise the right engine, gear and lsd diff oils for 2002 Tahoe. It is used in a rather hot climate 35-40 C in summer. I feel that factory specs are somewhat insufficient in my case. Thank you in advance!
I am a fan of the amsoil severe gear line of fluids. You ever try those in your truck?
+philip dias I have not. I've heard nothing but good things about Amsoil! I just haven't had the urge to really try it.
philip dias AMSOIL IS ALL HYPE!
Schaeffer MFG is Americas oldest oil company. They provide some of the best lubricants in the world. Schaeffer has 53 Certified Lubrication Specialists, how many does Amsoil have? Anyone who has seen Schaeffer up against any other oil knows it cannot be beat as far as engine protection.
www.schaefferoil.com Since 1839 these guys know their lubrication!
Good info and one more important piece of information to add. Some of the gear oil does not contain a friction modifier,If you have a limited slip differential that will need to be added or costly repairs will soon show up.
Yes, exactly! Thanks for the comment!
I own a 2007 fj cruiser that requires SEA 90 FOR ABOVE 0' Fahrenheit And 8w or 80w-90 below 0' degrees Fahrenheit do you think I can use 75w 90 just make sense for me.
I'm looking for 140 weight gear oil, but idk what that means. I need 140 or an equivalent
I have 80-90 gear oil in my Kubota Lawn tractor gear box. If I buy the one 75w140 that you recommend, can I just add it to the 80-90 oil in the gear box or can you mix them?
thanks buddy! I just changed out the oils yesterday. I put 75w90 in front and 75w140 in rear. Wanted to put 75w140 in both but went with the 75w90 in front instead.
you are creating different resistance levels between the differentials and that creates stress on the system. if the manufacturer doesn't indicate difference in viscosity between the diffs then you shouldn't do otherwise.
@@minogoda how much stress because they're pretty similar for it seems. Can you out the 75w-140 in the front differential? Seems like the gearing strength would be different from front vs back?
@@minogoda What ? My 2007 Nissan manual says front Differential 80w-90 the rear 75w-140 Synthetic so its done all the time.
Is there really much difference? Dealership put 75w140 instead of 75w90 like the manual says, I really ever tow. I think the only thing different would be like a 5% decrease in MPG. May have been something they changed back a few years ago.
There really isn't a whole lot of difference no, but usually even if you do tow with the vehicle once in a while, factory suggested oils in the owner's manual will be just fine.
Never didn't noticed a difference in MPG by the way.
Roger that, good to hear man! Thanks!
good video man , what is the difference between hypoid and synthetic , i have a 73 Dodge Charger with 8 3/4 with sure grip what do you recommend , been ttold that hypoid is better
thanks in advance
+anil k
If I come across an 07 Edge that needs this work done I will definitely make a video of it for you! As of right now I don't even know anyone that drives a Ford Edge though. I'll keep my eyes peeled, thanks for the comment!
Iam in south africa and its hot , can I use 85w 140 instead of 80w 90
Question. What vescosity should i use if my diffs are very noisy? Should i use the 140 to minimize the noise?
What happens if you mix 75-90 and 75-140. Could this cause a problem or will it be alright
Yes, I'm looking for a gear lube. Basically, that's fully synthetic. White is 6575. Are manual transmission please help.
What would you recommend for a 2013 dodge challenger rt? My manual says 75w90 with friction modifier but the dealer says my car is supposed to use 75w-140 with none. I love in california for now but eventually i will move back to the midwest where it can get pretty cold in the winter. Your advice will be greatly appreciated!
Ryan Vaal do what the manual says not the person who told you at the dealer because he could be wrong cause he’s not dealing with just your car or pick up truck, he’s dealing with every car in the dealer...
Ryan in my research if there is a limited slip diff. on the vehicle of any kind the friction modifier is a MUST. it protects as well as aides the diff. as far as colder climates I would use the heavier 75w140 if the temp were going to be a constant freezing or below. (However I also realize that this does void any warranty if any thing fails) 32 degrees or below for several days in a row can be enough to freeze oil/break fluid/transmission fluid not the resoviors or holding tanks as much as condensation in the lines.
My pinion seal has been leaking. Ran just about dry. I bought a quart of synthetic 75w-140, not enough, added a half quart of valvoline conventional 85 -140, not enough, added a full quart of 80-90 marine that was for my boat. Will they all mix and work to lube the diff and bearings till I change the seal? Or am I going to do any damage? Better than running dry, I figure. Thx Ken
That's a good question...my best advice is that it's okay to mix them as a 'limp home' thing to make sure you don't run dry and get you to where you need to go, but i would change out the seal and the fluid as soon as you can just to be safe, before any premature wear and tear begins to happen.
I put 75-140 in the front differential it calls for 75-90 will it make a difference
Also 75w90 for better fuel economy
I live in Alaska and run 85 140 all year long on a Ford F250 4x4 front and rear and is excellent lube all year long.
Nice! Thanks for the comment!
I'm about to put the same in my rear diff plus it's in my front already. 99 suburban, northern region of America
💯
Hi, do you recommend this for differential oil, e.g. Mercedes?
MITASU GEAR OIL GL-5 75W-90 LSD 100% Synthetic
Hi,
I just bought a 2015 Toyota Tacoma PreRunner V6 with 100000 miles.I live in Wilmington,NC.
I tow a 20ft. Boat. 3500 lbs.The manual say 75W-85 GL-5. Should or can I use mobile 1 75W-90 ?
Thank for your time/videos
Jim
For SUV, is it good to use 75W-80 ?
Hi. My motorcycle uses semi 10w40 oil. I have in a quart a mix of liqui moly, Motul and Wolf Belgium semi synthetic on excedent from previous bottles when changing oil. Can I use this tree brand mix with identical API and JASO specs? Thanks in advance.
First number is the cold viscosity, the second number is the operating temp (90°C) viscosity. So these oils all THICKEN up when they get warm. (Like engine oils)
No, they do get thinner. But they protect as well and hold up as well as a 90 or a 140 weight oil would at 100 degrees Celcius, rather than just a 75 weight. Think about pouring oil in the middle of winter compared to draining it from your oil pan after the engine runs. It's thicker when it's cold, that's just how fluid dynamics work. Thank you for the comment though!
Does all these 3 oils have almost same viscosities and can be interchangeable as a gear oil in transmission of 110cc gearless scooters.
SAE 10W30 engine oil ,
API GL-4 SAE 80W-90 gear oil and
GL-4 SAE 90 grade gear oil.
My recommended oil is 75-80 but every shop I go I'm being told either 75-90 or 75- 85 I'm scared would you kindly advise I have 280k on the clock
I just changed my ram 1500 diff fluid with 75w90 in the rear diff it has a lsd and I went with Royal Purple because it has the friction modifier already in it…. Anyone else have any experience with royal purple. I didn’t add the mopar additive because it says it has the friction modifier already.
is the 140 better for an older vehicle like a 1960 ford
My Honda ATV calls for 80W-90 in the rear and front differential. I would like to switch to synthetic and I have found that most synthetics are in 75W-90. In your opinion, is it safe to go from 80W to 75W?
Amzoil makes a synthetic 80W-90 gear oil. Some NAPA auto parts carry Amzoil or you can order it direct from the Amzoil website
For 2012 awd Sienna, Toyota manual says 75w85. The service departments keep 75w140 and use that in everything that comes through
I’m in Ohio
What would be best for the transfer case & differential?
Thank You
Transfer case and differentials would all depend on what Toyota recommends. I'd stick with what they say for those because they're probably specific fluids.
Hi midwest garage I live in Mexico and I was wondering which oil should I use for my differential for my Nissan pickup I tow a lot I put like two tons I use it daily also what do you recommend on how long should I change differential oil
Which one is better for positraction vs. Limited-slip
That depends on what your manufacturer recommends. Most LSD's will need some sort of additive though, so please keep that in mind when choosing a gear oil.
@@MidwestGarage ok thanks, . I have posi traction no LSD
Can you reply to me kind a like ASAP to let me know if mag1 Oil SAE 85W-140 would work in my RC car differential for the gears I don’t wanna open it without knowing what’s someone else thinks
Well explained , good job
Can I use API GL-4 SAE-90 GEAR OIL in Transmission of TVS Jupiter or Honda Activa 4G 110cc gearless scooters?
Will it reduce the performance, pickup & milage and increase the wear & tear of transmission gears of scooter?
TVS company manual recommended to use same engine oil (10w30 JASO MA2) as the gear oil in transmission also.
Whats the best oile for a limitid slip diff 8.5 10 bolts . And there is a mopar limitid slip additive and acdelco additive . What should i use
I think for these diffs the ideal lubricant is a 75w110 with 4 oz of ACDelco additive. You could use the mopar stuff if you'd like, but being a GM differential I'd stick to GM OEM and go with Delco. Hope this helps, and thanks for the question!
@@MidwestGarage man you are awsome downtoearth type a guy . This video is almost 5 years old and you still reoly on our cumments . You are awsome .
@@MrEyad1990 Haha thanks bud, I appreciate the kind words! I try my best to answer comments on all my videos, even the older ones!
Thank you for the great information! This answered all of the questions I had.
I'm rebuilding my differential in a 94 Dodge Ram 350 passenger van has the 9 and 1/4 differential actually basically what I'm doing is putting new bearings and seals the pinion gear is humming is there anything special I should put in the fluids after putting it all back together
If you use a synthetic gear lube that should have all the stuff you'd need in the fluid. You'll here some people say you shouldn't use synthetics in older diffs and in some limited slips, but that's simply a myth. Other than that if it is a limited slip be sure to add LS additive and you should be good to go. Thanks for the comment!
Thank you for your response look I have a question since I'm sending you a message now I have gotten everything back together actually what I've done is I went in and rebuilt the rear end I'm putting it back together as we speak I put the gear paint on the ring gear to see where I was getting contact should I remove all that from the rear end before I finish it off or is it okay to leave it on.
Sorry I'm a little late getting to this, but you're fine to leave that on there it won't hurt anything at all. Thanks for the questions and comments!
Bear in mid that the more the difference between the the two viscosity (cold and hot), the more the oil will follow the higher number while it is deteriorating. I.e:
75W-140 has a difference of 65
75W-90 has a difference of 15
As both oil types get old and contaminated, their overall viscosity will be higher and their property may be:
120W-150
85W-95
So, a lower cold viscosity number does not necessary mean that it is going to hold that so long. The oil has to be in check.
Yup. All oils break down over time and need changing, you are right. They won't perform the way they're supposed to after time and so they need to be changed. Thanks for the comment!
What oil should I use for my 1985 chevy m1028? About the climate mostly is hot
Motor oil I’d use a 5w30, and for axle lube I believe they take an 80w-90 gear lube...but that could be wrong since it’s military grade. Try googling “TM-9-2320-289-20”. That’s the technical manual for those trucks and it should have everything you’d ever need for that truck. Those things are awesome by the way, I’ve always wanted one!
what is the thickest gear oil to ever exist ?
got a question. I changed my front diff seal and it still leaks. original seal was bad. manual recommends 75-90 and I changed to a 75-90 synthetic after I put in new seal. Should I change to 80-90W NON synthetic because I heard that synthetic gear oil may actually cause leaks, especially on a truck with high mileage. thanks for any advice.
That's a good question...a lot of myths out there about synthetics are simply not true, whether it comes to synthetic motor oil, transmission fluid, or gear oil. However, if you do have leaks even after changing out the seal you could definitely try out an 80 rather than 75. It might not do the trick, but it's worth a shot. Just know that usually the "synthetic causes leaks" is a myth. I could go more in depth but really whether it's synthetic or not, it's the same viscosity so that's not what causes the leaks. Basically the leak started or continued because the old fluid was so gummed up and old that it simply plugged the leaks. So even if you changed it out with non-synthetic it would have probably continued to leak out because the new fluid was not gummed up and would be able to seap out of those tiny leaky areas. I hope this helps bud, and thanks for the question!
Ok I highly recommend to follow what owner manual or manufacturers. There’s the difference between 75w90 and 75w140. 75w140 design for vehicles that towing heavy loads like close to maximum of Gross weight Combined rating or maximum , people who using for racing like accelerating hard all the time, however will sacrifice gas mileage…. 75w90 does give you better gas mileage and if towing occasionally then that for you, but if towing frequently but loads not even close to maximum and or if worry about gas mileage then you wanna go with full synthetic 75w90 which better than regular 75w90
I have a 49cc gasoline scooter. Could you kindly inform me what particular GL4 gear oil to use. I don't plan on riding during the winter months, and I reside in MA Thank you very much
Oof...on that one I'm really not sure. I would just go with what the manual or the dealership says and you should be good to go.
Thanks for the great help man , was rebuilding my diff.
Valvoline over Lucas?
last week I changed out factory fill in rear diff "g80" with ac delco 10_4016 75w 90. now the rear end acts like its lock during slow right turns. any idea on how I fuck this up.
What does the manual say to use for diff fluid? The G80 may need an additive since it's a LS rearend.
Midwest Garage the manual says I'm a douche bag for changing it out @ 3000 miles. IDK what it calls for.
You just need to add a small bottle of "Friction modifier" for traction lock or posi trac or limited slip differentials... No biggie..
carl gustav my old s10 recommended a diff change with the first oil change. 30k after that.
did the same thing, the grape juice is not for the g80. had to use Walmart oil
I have a 2006 Honda Ridgeline the manual says T-case oil takes sea-90 weight. The dealer gave me 75 -85 but I'm going to be driving it in hot weather towing a trailer I think what they gave me is wrong.
Yeah I'd check with them again and ask why they didn't give you what the manual says.
oils are tested at 40C for the W number and at 100C for the second number. common mistake is people think oil is thinner when cold but the scales are diffrent .
zloben9000 how you read multi weight oil designation is that the oil behaves like what ever the first viscosity is at that 40 degrees celsius and behaves as the second viscosity at 100 degrees celsius. lower viscosity oils are thinnet than higher viscosity, but no matter the viscosity, oils gett thicker as the temp decreases
guys what about 75W-110 ? what do you think about 75W-110 it's kind of between 75w90 and 75w140
That wouldn't be a bad one. I'd go off manufacturer's recommendations, but if you have similar conditions to what I talked about a 75w-110 would be good for your rear diff.
Midwest Garage manufacturers recommendation is 80W90 hypoid oil, I like to use synthetic oil so best option for me 75W110 fully synthetic hypoid gear oil 👍💯
Great video! I have Highlander 2011 4WD. The manual says 80W-90 GL-5. I could not find synthetic 80W-90. Can I use 75W-90 Mobil 1 synthetic? I am just afraid because 80 is different than 75? Which is better for the car? What about summer will 75 not be good as 80?
Thanks
I would stick to the manufacturer's recommendations, especially in a nicer vehicle like that. One important thing however, if they tell you to use a GL-5 gear lube, definitely use GL-5.
Thank you so much for your reply. Just want to understand what is really the difference between 75W-90 and 80W-90. 75 is thicker than 80 or the other way around.
Also do you think 75w synthetic will offer better protection in winter than 80W?
Thanks
zofa300 @
hello good video I just moved from California to Washington St completely different temperatures right now is snowing and I would like to change my oils on my differentials my truck is a 2006 chevy silverado 1500 5.3 z71 4wd should I use 75w140 all around?
axle oil 140 for lorry but used 85-90 then gearbox oil 80-90 but using 15-40. any dangerous if using different oil ?
i just accidently put in a quart of 75w-90 and a little more than a quart of 75w-140 in my rear differential. I thought i bought 3 quarts of 75w-140 and accidently bought one 75w-90 and didnt realize until i finished and looked at the reciept and checked my empty bottles. Is that bad or will it cause a problem? Im thinking about just putting in more 75w-140 or just biting the bullet and changing the oil again.
royal purple was the brand of oil
I believe you should be fine. If you want you can replace the fluids.
The most important thing about gear oil is that it is clean, and that it is the correct level/amount. ANY gear oil is better than very dirty or very low gear oil. You could use cooking oil to get you to proper service in an emergency - it would be better than nothing.
The only thing to be aware of, is if certain gear oils are not recommended because of material incompatibility. IE: if a certain fluid is ONLY recommended because others will damage seals or gearbox metals etc. THEN is when you must be careful.
Most light trucks and passenger vehicles with separate differentials are ok with most types of gearbox fluids. But some are very fussy, AUDI, VW, Mercedes, etc. Only put the exact correct fluid in those things.
Stay gold.
I live in Texas and I have a 2008 Dodge Ram 1500, what would be the ideal gear oil for my truck? The truck is used for work and back and rarely do any hauling. Thanks!!
+Stephen Lepek If your Ram isn't towing or being worked real hard, use 80W90 in the rear. 75W140 for the front diff. BUT, there is one important step you also need to do! Dodge is one of the few truck companies that still comes with a LSD (posi) as a standard option...so if your truck has it, you need to add some friction modifier to the rear differential when you change the fluid. The friction modifier is just a limited slip additive, and if you're unsure if you have an LSD or not, you can add the stuff anyway with no harm just to be safe. Hope this helps!
Thanks man! I really appreciate that!!
+Stephen Lepek 75w-140 is what is used in my 07 ram
Can you mix 80w 90 with 75w140
Whats the difference in an oil that only says 75w like Ravenol mtf-3? It does not have the other number afte the "w"
sam problem only say 75w gl 4 dual dry cluch what oil i shud replays biside oem oil
Where I live it is mostly hot weather. Much like California or Miami. In the Summer it gets to over 50'C at times. What kind of oil would you suggest for that?
I would suggest whatever the owner's manual says for that warm of weather. Thanks for the comment, hope this helps!
Shut up
some people dont change gear oils at all
it took me 10 mins to do: i changed my gear oil to Synthetic Mannol 75w90 GL5 spec(cheapest synthetic 75w90 i found) , i drive a small 2007 toyota yaris and i dont tow, my recommendation is to CHANGE THE GEAR OIL every 5 to 10 years and dont just top it up, the old oil was GREY and the new was CLEAR-to-yellow car shifts a lot better especially when in reverse.
both plugs are 24mm and you need 1.9 liters of gear oil in case someone googles for specs.
zloben9000 port
P
I used to own a 2000 Tundra. I couldn't even change the axle oil. I had to buy complete whole new rear end axle at 155,000 miles it went slipping or it will lock up. It was wielded shut it has a cap on top of it. You couldn't even replace the gears till you cut it open. I was told that you had to go to the dealership and have them to do a hose flush to flush out your axle. Was so lame and Never forgotten to do a 4x4 transfer case oil change with the gear oil. I have over 472,000 miles on that V6 4x4 2000 Toyota Tundra. I sold it. Was a beast small mid size truck ever built. I had a custom axle on mine so I could replace the oil. The transmission will go out at 140 to 150,000 miles as well. I do replace the oils system and filters every 60,000 miles.
I wish people take care of their cars mores or have the knowledge to do it. Some people have no idea about changing the complete car oil system.
Now from now on I used Amsoil in my entire trucks now. I change mine every 60,000 miles on a GM 2500HD or within 4 years just as much as for other things on your vehicle like transmission fluid with new filter, steering oil and breaks oil and changing breaks. I always spent around 350 bucks every time and it worth it. Last you 600,000 miles or more depends how you take care of the trucks or cars that you drives. You would also needed to changing your crank staff chain or your overhead cam chain at 150,000/200,000/250,000 miles depend on what vehicle you have plus the exhaust system replacement as well. Big lesson I learned. I used amsoil gear oil 75Ww140 for a heavy duty used for my aluminum G2 cooling differential axle cover that does added extra oils space as well as it allowed you to change the gear oil too that included the magnetic dip stick. I add 6qt 10.5 on gas and 7qt on 11.5 diesel. And never failed me. I also do change the clutch and gear on the axle at 200,000 miles.
You could say I drove over billions of millage in my hard earn years lol..
I'm sure it's fine if I need to top off my rear diff fluid with 75w-90 if it already has 75w-140. Or mixing brands if their still the same API rating.
Yes, it's okay to mix brands. However if mixing viscosities I'd do so only for momentarily before switching out the fluid.
GREAT CAN YOU SHOW HOW TO CHANGE TRANSFER CASE FLUID IN FORD EDGE 2007 . THE PLACE IS JAM PACKED AND THERE IS SOME OIL LEAK TOO NEAR THE TRANSFER CASE. THANKS
Thanks bro, if my 2015 yoda calls for 75 85 in diff, do you think 75 90 would be bad? Also I live in California and it is hot.
I'd stick to the manufacturer's recommendations, unless you're really doing some serious hauling or in extreme temperatures.
I hear 75w-140 is good to be used in both front and rear diffs. Ive got a 2004 ford explorer 4x4. I dont tow much but will be eventually. Im also going to move up north canada where its damn cold. Think i will stick with 75w-140 for both :-) Would you advise that? Thanks!
+rainy78 Yeah, I would recommend that. Ford & Mercury just recently changed their lube requirements a few years ago. They say to use 75w140 instead of the 75w90 now in rear differentials.
Great simple presentation.
Hi there can use Mobil 1 75w90 ls in a conventional differential? Thanks
It depends on the differential and what vehicle. The owner's manual should be able to tell you if that's a good one to use or not. Thank you for the comment!
@@MidwestGarage thanks I owen 2004 4runner and don't have the manual
Hmm...I'm not really sure on those Toyotas. I'm thinkin the best way to find out for sure is to use the good old google. Might even be able to find a service manual on line for that vehicle. I hope this helps!
Thank you very much for your time ✌
@@lagunez12 Any time! Thank you!
Great gentleman 👍
so the manual says lubed for life with 75w 140 if you put anything other then synthetic on its every 3k if you use full synthetic you also need an additive should i change it not knowing the history of the truck btw it has 84k 2005 ford ranger 2.3
I just got a new truck, new to me 2014 Tundra..I went through and changed the rear dif and the trans oil. It gives me the knowledge and satisfaction that its done right!
Hey ? So I can use 75w140 for my highlander 2004 in florida ???
If you're running it hard I'm sure you could, but usually unless you're doing extreme work in extreme temps I'd stick with the manufacturer's recommendations.
even better run synthetic gear oil has much higher performance in both cold and hot. GM factory fills diffs with synthetic for a good reason, it almost stopped all warranty rear diff claims
Very good point! I can't remember for certain but I think I mentioned the synthetic gear oil in my video also. Thank you for the comment man!
My Tacoma manual request 80w 90,, what's the difference between 75w90?
One could be synthetic and the other not...but the main difference is that the 75 is slightly better in slightly cooler temps is all, or very slightly less viscous than the 80w90. Those 2 are very similar weights.
Thanks for the question man!